Alkali-metal thermal to electric converter

An alkali-metal thermal-to-electric converter (AMTEC, originally called the sodium heat engine or SHE) is a thermally regenerative electrochemical device for the direct conversion of heat to electrical energy.<ref name="ref1">N. Weber, "A Thermoelectric Device Based on Beta-Alumina Solid Electrolyte", Energy Conversion 14, 1–8 (1974).</ref><ref name="ref2">T. K. Hunt, N. Weber, T. Cole, "High Efficiency Thermoelectric Conversion with Beta″-Alumina Electrolytes, The Sodium Heat Engine", Solid State Ionics 5, 263–266 (1981).</ref> It is characterized by high potential efficiencies and no moving parts except for the working fluid, which make it a candidate for space power applications.<ref name="ref2"/>

It was invented by Joseph T. Kummer and Neill Weber at Ford in 1966, and is described in US Patents 3404036, 3458356, 3535163 and 4049877.

Design

An Alkali-metal thermal to electric converter works by pumping something, usually sodium, though any Alkali metal will do, through, around, and over, a circuit. The heat evaporates the sodium at one end. This puts it at high pressure. It then passes through/over the Anode, releasing electrons, thus, charge. It then passes through an electrolyte to conduct it to the other side. This works because the electrolyte chosen can conduct Ions, but not electrons so well. At the Cathode, the Alkali metal gets its electrons back, effectively pumping electrons through the external circuit. The pressure from the electrolyte pushes it to a low-pressure vapor chamber, where it “cools off” to a liquid again. An electromagnetic pump, or a wick, takes this liquid sodium back to the hot side.<ref>"Thermoelectricity - Alkali Metal Thermal Electric Generators AMTEC". www.mpoweruk.com. Retrieved 2021-01-20.</ref>

This device accepts a heat input in a range 900–1300 K and produces direct current with predicted device efficiencies of 15–40%. In the AMTEC, sodium is driven around a closed thermodynamic cycle between a high-temperature heat reservoir and a cooler reservoir at the heat rejection temperature. The unique feature of the AMTEC cycle is that sodium ion conduction between a high-pressure or -activity region and a low-pressure or -activity region on either side of a highly ionically conducting refractory solid electrolyte is thermodynamically nearly equivalent to an isothermal expansion of sodium vapor between the same high and low pressures. Electrochemical oxidation of neutral sodium at the anode leads to sodium ions, which traverse the solid electrolyte, and electrons, which travel from the anode through an external circuit, where they perform electrical work, to the low-pressure cathode, where they recombine with the ions to produce low-pressure sodium gas. The sodium gas generated at the cathode then travels to a condenser at the heat-rejection temperature of perhaps 400–700 K, where liquid sodium reforms. The AMTEC thus is an electrochemical concentration cell, which converts the work generated by expansion of sodium vapor directly into electric power.

The converter is based on the electrolyte used in the sodium–sulfur battery, sodium beta″-alumina, a crystalline phase of somewhat variable composition containing aluminum oxide, Al₂O₃, and sodium oxide, Na₂O, in a nominal ratio of 5:1, and a small amount of the oxide of a small-cation metal, usually lithium or magnesium, which stabilizes the beta″ crystal structure. The sodium beta″-alumina solid electrolyte (BASE) ceramic is nearly insulating with respect to transport of electrons and is a thermodynamically stable phase in contact with both liquid sodium and sodium at low pressure.

Development

Single-cell AMTECs with open voltages as high as 1.55 V and maximum power density as high as 0.50 W/cm² of solid electrolyte area at a temperature of 1173 K (900 °C) have been obtained with long-term stable refractory metal electrodes.<ref name="ref3">R. Williams, B. Jeffries-Nakamura, M. Underwood, B. Wheeler, M. Loveland, S. Kikkert, J. Lamb, T. Cole, J. Kummer, C. Bankston, J. Electrochem. Soc., V. 136, p. 893–894 (1989).</ref>

Efficiency of AMTEC cells has reached 16% in the laboratory. High-voltage multi-tube modules are predicted to have 20–25% efficiency, and power densities up to 0.2 kW/L appear to be achievable in the near future. Calculations show that replacing sodium with a potassium working fluid increases the peak efficiency from 28% to 31% at 1100 K with a 1 mm thick BASE tube.

Most work on AMTECs has concerned sodium working fluid devices. Potassium AMTECs have been run with potassium beta″-alumina solid electrolyte ceramics and show improved power at lower operating temperatures compared to sodium AMTECs.<ref name="ref4">R. M. Williams, B. Jeffries Nakamura, M. L. Underwood, M. A. Ryan, D. O'Connor, S. Kikkert (1992) "High Temperature Conductivity of Potassium Beta″ Alumina", Solid State Ionics, V. 53–56, p. 806–810.</ref><ref name="ref5">R. M. Williams, A. Kisor, M. A. Ryan (1995) "Time Dependence of the High Temperature Conductivity of Sodium and Potassium Beta″ Alumina in Alkali Metal Vapor", J. Electrochem. Soc., V. 142, p. 4246.</ref><ref name="ref6">R. M. Williams, A. Kisor, M. A. Ryan, B. Jeffries Nakamura, S. Kikkert, D. O'Connor (1995) "Potassium Beta″ Alumina/Potassium/Molybdenum Electrochemical Cells", 29th Intersociety Energy Conversion Engineering Conference Proceedings, AIAA, Part 2, p. 888.</ref><ref name="ref7">A. Barkan, T. Hunt, B. Thomas, (1999) "Potassium AMTEC Cell Performance", SAE Technical Paper 1999-01-2702, Barkan, A. (1999). "Potassium AMTEC Cell Performance". SAE Technical Paper Series. Vol. 1. doi:10.4271/1999-01-2702..</ref>

A detailed quantitative model of the mass transport and interfacial kinetics behavior of AMTEC electrodes has been developed and used to fit and analyze the performance of a wide variety of electrodes, and to make predictions of the performance of optimized electrodes.<ref name="ref8">R. M. Williams, M. E. Loveland, B. Jeffries-Nakamura, M. L. Underwood, C. P. Bankston, H. Leduc, J. T. Kummer (1990) "Kinetics and Transport at AMTEC Electrodes, I", J. Electrochem. Soc. V. 137, p. 1709.</ref><ref name="ref9">R. M. Williams, B. Jeffries-Nakamura, M. L. Underwood, C. P. Bankston, J. T. Kummer (1990) "Kinetics and Transport at AMTEC Electrodes II", J. Electrochem. Soc. 137, 1716.</ref> The interfacial electrochemical kinetics can be further described quantitatively with a tunneling, diffusion, and desorption model.<ref name="ref10">R. M. Williams, M. A. Ryan, C. Saipetch, H. LeDuc (1997) "A Quantitative Tunneling/Desorption Model for the Exchange Current at the Porous Electrode/Beta-Alumina/Alkali Metal Gas Three-Phase Zone at 700-1300", p. 178 in "Solid-State Chemistry of Inorganic Materials", edited by Peter K. Davies, Allan J. Jacobson, Charles C. Torardi, Terrell A. Vanderah, Mater. Res. Soc. Symp. Proc. Volume 453, Pittsburgh, PA.</ref><ref name="ref11">R. M. Williams, M. A. Ryan, H. LeDuc, R. H. Cortez, C. Saipetch, V. Shields, K. Manatt, M. L. Homer (1998) "A Quantitative Model for the Exchange Current of Porous Molybdenum Electrodes on Sodium Beta-Alumina in Sodium Vapor", paper 98-1021, Intersociety Energy Conversion Engineering Proceedings, Colorado Springs, Colorado, (1998).</ref> A reversible thermodynamic cycle for AMTEC shows that it is, at best, slightly less efficient than a Carnot cycle.<ref name="ref12">C. B. Vining, R. M. Williams, M. L. Underwood, M. A. Ryan, J. W. Suitor (1993) "Reversible Thermodynamic Cycle for AMTEC Power Conversion", J. Electrochem. Soc. V. 140, p. 2760.</ref>

A related technology, the Johnson thermoelectric energy converter, uses a similar concept of pumping positive ions through an ion-selective membrane, using hydrogen rather than an alkali metal as the working fluid.<ref>Lonnie G. Johnson (2019). "Johnson Thermo-Electrochemical Converter (JTEC) as a Heat to Electric Generator for Nuclear Power Systems," Nuclear and Emerging Technologies for Space, American Nuclear Society Topical Meeting, Richland, WA, February 25–28, 2019. Retrieved 22 Oct. 2021.</ref>

Applications

AMTEC requires energy input at modest elevated temperatures and thus is easily adapted to any heat source, including radioisotope,<ref name=Mondt2014 /> concentrated solar power, external combustion, or a nuclear reactor. A solar thermal power conversion system based on an AMTEC could have advantages over other technologies for some applications including (thermal energy storage with phase-change material) and power conversion in a compact unit. The overall system could achieve as high as 14 W/kg with present collector technology and future AMTEC conversion efficiencies. The energy storage system has the potential to batteries, and the temperatures at which the system operates allows long life and reduced radiator size (heat-reject temperature of 600 K).

NASA investigated AMTEC conversion as a next-generation radioisotope power source for deep-space applications,<ref name=Mondt2014>Jack F. Mondt and Robert K. Sievers (2014). "Alkali Metal Thermal to Electric Converter (AMTEC) Technology Development for Potential Deep Space Scientific Missions", NASA Jet Propulsion Laboratory. Retrieved 22 October 2021.</ref><ref>M.A. Ryan (1999). "The alkali metal thermal-to-electric converter for Solar System exploration", 18th Int. Conference on Thermoelectrics, ICT'99, 29 Aug.-2 Sept. 1999. DOI: 10.1109/ICT.1999.843468</ref> but the technology was not selected for the next-generation systems.

While space power systems are of intrinsic interest, terrestrial applications could offer large-scale applications for AMTEC systems. At the 25% efficiency projected for the device and projected costs of 350 USD/kW, AMTEC could prove useful for a very wide variety of distributed generation applications including self-powered fans for high-efficiency furnaces and water heaters and recreational vehicle power supplies.